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α-Al₂O₃籽晶对Al₂O₃晶型转变及形貌的影响

Effects of α-Al₂O₃ Seeds on the Phase Transformation and Microstructure of Alumina

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【Author】 LI Jiang, PAN Yu-Bai, NING Jin-Wei, HUANG Li-Ping, GUO Jing-Kun(State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

【机构】中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室；中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室上海 200050；上海 200050；上海 200050；

【摘要】在湿化学法合成的纳米Al2O3前驱体NH4Al(OH)2CO3中添加α-Al2O3籽晶(150nm左右),研究了α-Al2O3籽晶对Al2O3晶型转变及形貌的影响.结果表明,少量α-Al2O3籽晶的添加能降低形核温度,有效的提高相转变速率,在较低的温度下完成θ→α-Al2O3的相转变,同时对聚合生长也产生一定的影响.更多还原

【Abstract】 Nanometer NH4Al(OH)2CO3 precursor was synthesized from NH4Al(SO4)2 and NH4HCO3. The effect of α-Al2O3 seeds (-150nm) on the phase transformation and micrograph of alumina was studied. The results show that under the conditions of adding a small quantity of α-Al2O3 seeds, the nucleating temperature can be lowered, the transition rate enhanced effectivelly, the transition of Al2O3 from θ to α phase can be completed at a lower temperature, and the grain accumulation can also be influnced to a certain extent.更多还原